<template>
  <el-container>
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" />
        <span>电商管理系统</span>
      </div>
      <el-button @click="checkout" type="info">退出</el-button>
    </el-header>
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'65px':'200px'">
        <div class="toggle-button" @click="toggleClick">|||</div>
        <el-menu background-color="#333744"
                 text-color="#fff" 
                 active-text-color="#409eff" 
                 unique-opened 
                 :collapse='isCollapse'
                 :collapse-transition='false'
                 router
                 :default-active="activePath"
                 >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''"
                      v-for='item in menulist' 
                      :key='item.id'
                      >
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span slot="title">{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path"
                          v-for='subItem in item.children' 
                          :key='subItem.id'
                          @click="saveNavState('/'+subItem.path)"
                          >
              <template slot="title">
              <i class="el-icon-menu"></i>
              <span slot="title">{{subItem.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      menulist: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuData(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    checkout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuData() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    toggleClick() {
      this.isCollapse = !this.isCollapse
    },
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
  background-color: rgb(55, 60, 65);
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  color: #fff;
  font-size: 20px;
  align-items: center;
  div {
    display: flex;
    align-items: center;
    img {
      margin-right: 0;
    }
    span {
      margin: 15px;
    }
  }
}

.el-aside {
  background: rgb(50, 55, 68);
  .el-menu {
    border-right: 0;
  }
}

.el-main {
  background-color: rgb(234, 237, 242);
}

.el-container {
  height: 100%;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  color: #fff;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
